Mayoral candidate Charlotte Golar Richie is adding the endorsements of three former elected officials of color, bolstering her growing roster of key supporters.

Boston’s first black State Senator Bill Owens and three former state representatives—Royal Bolling, Doris Bunte, and Shirley Owens-Hicks—will formally endorse Golar Richie Thursday evening at an event at Phillips Old Colony House in Dorchester.

Owens served 12 years as a state senator, at the time making him one of the state’s highest-ranking black officials.

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Golar Richie, a former state representative, is one of six candidates of color vying to replace Mayor Thomas M. Menino, and the only woman in the race.

She has focused parts of her campaign on winning the backing of influential black officials, including earning the endorsement of Johnny Ford, the former mayor of Tuskegee, Ala.; marching alongside Cecile de Jongh, the first lady of the US Virgin Islands, during the annual Caribbean Carnival festival; and having Harvard professor Charles Ogletree as a campaign adviser.

The majority of current elected officials of color have not yet endorsed a candidate in the mayor’s race.